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Detonation Deferred Firing Head

IP.com Disclosure Number: IPCOM000184082D
Publication Date: 2009-Jun-10
Document File: 2 page(s) / 429K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method and apparatus to delay the initiation of detonation of a downhole perforating gun, using a shearing device, and varying flow areas to adjust the velocity of a piston. The purpose of the delay system is to allow the operator to selectively perforate more than one zone in a multi-zone well at different time.

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Detonation Deferred Firing Head

Abstract:

A method and apparatus to delay the initiation of detonation of a downhole perforating gun, using a shearing device, and varying flow areas to adjust the velocity of a piston.  The purpose of the delay system is to allow the operator to selectively perforate more than one zone in a multi-zone well at different time.

Description:

During the completion of an oil or gas well, a length of casing is cemented in a borehole, and then one or more zones of the casing are perforated to communicate the bore of the casing with subsurface geological formations intersected by the borehole so that oil or gas from that subsurface formation may be produced by the well.

One well-known type of perforating system is a tubing conveyed perforating system wherein the perforating guns and related apparatus are carried by a tubing string made up of a plurality of threaded joints of tubing or pipe which are connected together and lowered into the well. These tubing conveyed completion systems may be run in combination with a drill stem test string so that the well can be perforated and tested in a single trip.

In some situations, it is desirable to be able to selectively perforate more than one zone of the well at different times. The prior art has typically addressed this need by the provision of multiple firing heads which are constructed to actuate at different operating pressures. With these systems, the selection of the appropriate firing head and gun to be fired is determined by the pressure which is applied to the t...